SOLUTION: the average of 2 numbers is M, One number is N, What is another number ?

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Question 601570: the average of 2 numbers is M, One number is N, What is another number ?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
One number is N
let other number be P
(P+N)/2 = M
multiply by 2
P+N = 2M
P= 2M-N